Rockwell Automation 140G-NTK-E12 LSIG and LSIG-MM Release - Manual (Page 12)

DIR 1000587R0002 (L3821)
(12)
3.1 Specifications
3.1.1 General
The LSIG-MM are high-performance self-powered protection units with Protection, Measurement, Data storage, Communication (optional)
Self-test and Load control functions for 140G-N and 140G-NS range of 3- and 4-pole low-voltage air circuit breakers. The unit’s user interface
also enables parameter setup and full prealarm and alarm management for protection and watchdog functions.
Basic protections available are:
Symbol Protection against
L overload with inverse long time delay
S short-circuit with adjustable delay
I instantaneous short-circuit
G earth fault with adjustable delay
U phase current unbalance
OT temperature off-range
MM maintenance module
The LSIG-MM can be installed on 3-pole CBs with and without an external neutral, or on 4-pole CBs.
Note that reference current is In (rated current defined by the front Rating Plug) and not Iu (uninterrupted rated current of the CB itself).
Example: 140G-N 1200 with a 400 A Rating Plug has an Iu of 1200A and an In of 400 A.
The unit opens the circuit breaker in which it is installed by means of the TC, which takes effect directly on the device’s mechanical linkage.
The protection unit is self-powered by current sensors.
The unit is made using digital microprocessor technology and interfaces with the user by means of a graphic display and keyboard.
3.1.2 Electrical characteristics
Rated operating frequency
50/60 Hz ±10%
Pass band 3000 Hz max
Peak factor 6.3 max @ 2 In
3.1.2.1 Self-powering
Self-powering enables protection unit to be powered with busbar current using current transformers.
Using this powering mode, unit’s protection functions are ensured, however, not the accessory functions regarding the modules. The characte-
ristics are given in the table below:
General characteristics relay enabling display switch-on
Minimum 3-phase busbar current to enable the relay and switch on the display >80 A >160 A
3 LSIG-MM Release - Identification
The LSIG-MM units available, with various protections, are illustrated in the following figure.
Protections
For all versions "U" "OT"
Optional module available
Communication module
LSIG-MM